An 8-channel CAN data logger

Abstract

The utility model provides a kind of 8-way CAN data recorder, including male head, CAN circuit, secondary MCU circuit, main MCU circuit, TF card storage circuit, data transmission circuit, 4G module and power supply voltage stabilizing circuit.Power supply voltage stabilizing circuit is used to power supply CAN circuit, secondary MCU circuit, main MCU circuit, TF card storage circuit, data transmission circuit and 4G module.The utility model is connected by setting secondary MCU circuit and main MCU circuit, the output end of two MCU chips of the secondary MCU circuit with 6-way CAN circuit, the output end of one MCU chip of the main MCU circuit with 2-way CAN circuit is connected;And the pin of the corresponding MCU chip STM32G473CBT6 of secondary MCU circuit is connected with the pin of the corresponding MCU chip STM32H723VGT60 of main MCU circuit;Therefore, the utility model uses the interconnection of 3 lower-priced MCU chips to realize the real-time recording of 8-way CAN bus data.

Description

Technical Field

[0001] This utility model relates to the field of CAN data logger technology, specifically an 8-channel CAN data logger. Background Technology

[0002] The CAN bus data logger is a dedicated device for real-time acquisition of vehicle bus data, playing a crucial role in automotive R&D testing, fault diagnosis, and intelligent connected vehicle applications.

[0003] Currently, the hardware circuit implementation of traditional 8-channel (or higher) CAN (CANFD) bus data loggers generally utilizes a single MCU with strong computing power and 8 CAN (CANFD) channels. This approach limits the selection of such chips and increases their cost, thus raising the overall cost of the logger and hindering its widespread adoption. Utility Model Content

[0004] The purpose of this invention is to improve and innovate upon the shortcomings and problems existing in the background technology, and to provide an 8-channel CAN data logger.

[0005] An 8-channel CAN data logger includes: Male connector, which is used to input constant power supply, ACC power supply and 8-channel CAN signals; A CAN circuit, comprising 8 channels, wherein the CAN circuit is connected to the output terminal of the male connector; A secondary MCU circuit, comprising two MCU chips, wherein each MCU chip of the secondary MCU circuit is connected to the output of a 3-channel CAN circuit; The main MCU circuit has one MCU chip, which is connected to the output terminals of the two CAN circuits and the MCU chip of the secondary MCU circuit. A TF card storage circuit is used for reading / writing data, and the TF card storage circuit is connected to the output terminal of the main MCU circuit. The 4G module is used for wireless data transmission and is connected to the output terminal of the main MCU circuit. A power supply voltage regulator circuit, which is used to connect to the output terminal of the male connector; The power supply regulator circuit is used to supply power to the CAN circuit, the secondary MCU circuit, the main MCU circuit, the TF card storage circuit, and the 4G module.

[0006] A further approach is that the MCU chip corresponding to the main MCU circuit is connected to the 4G module through a data transmission circuit, which is used to realize communication and data transmission between the MCU chip and the 4G module.

[0007] A further option is that the main MCU circuit uses an STM32H723VGT6 chip, and the secondary MCU circuit uses an STM32G473CBT6 chip.

[0008] A further option is to use eight TJA10513CBT6 chips in the eight-channel CAN circuit.

[0009] A further embodiment is that the power supply regulation circuit includes multiple voltage regulator chips; among them, the LM2576S-ADJ voltage regulator chip is used to reduce the 12V voltage to 5V to power the CAN chip; the ME6119C33M5GA voltage regulator chip is used to reduce the 5V voltage to 3.3V to power the MCU chip; the ME6119C33M5GA voltage regulator chip is used to reduce the 5V voltage to 3.3V to power the data transmission circuit and the TF card storage circuit; and the SPX29302T5 voltage regulator chip is used to reduce the 5V voltage to 3.8V to power the 4G module.

[0010] A further option is to use a high-speed USB chip, USB3300-EZK-TR, in the data transmission circuit.

[0011] A further option is that the 4G module adopts the SC200L-INTERNAL module.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model sets up a secondary MCU circuit and a primary MCU circuit. The two MCU chips of the secondary MCU circuit are connected to the output terminals of the 6-channel CAN circuit, and one MCU chip of the primary MCU circuit is connected to the output terminals of the 2-channel CAN circuit. The pins of the STM32G473CBT6 MCU chip corresponding to the secondary MCU circuit are connected to the pins of the STM32H723VGT60 MCU chip corresponding to the primary MCU circuit. Therefore, this utility model uses the interconnection of three relatively inexpensive MCU chips to realize the real-time recording of 8-channel CAN (CANFD) bus data. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an 8-channel CAN data logger provided in an embodiment of the present invention; Figure 2 Circuit diagram of the male connector provided in this embodiment of the utility model; Figure 3 A circuit diagram of the CAN circuit provided in an embodiment of this utility model; Figure 4 A circuit diagram of the data transmission circuit provided in an embodiment of this utility model; Figure 5 The circuit diagram of the power supply regulator circuit provided in the embodiment of this utility model. Detailed Implementation

[0015] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] Please see Figure 1 This utility model provides an 8-channel CAN data logger, including a male connector, a CAN circuit, a secondary MCU circuit, a primary MCU circuit, a TF card storage circuit, a data transmission circuit, a 4G module, and a power supply regulator circuit. The power supply regulator circuit supplies power to the CAN circuit, the secondary MCU circuit, the primary MCU circuit, the TF card storage circuit, the data transmission circuit, and the 4G module.

[0018] The male connector is a TE type TE174055-2 male connector, used for inputting constant power, ACC power, and 8-channel CAN signals. Constant power refers to the power source directly drawn from the positive terminal of the car battery, providing continuous power. ACC power is the power supply controlled by the car key. The output of the male connector is connected to the CAN circuit and the power regulator circuit.

[0019] In this embodiment, the CAN circuit obtains automotive diagnostic bus information from the male connector. The male connector's input voltage is 12V-24V, which is stepped down to 5V, 3.8V, and 3.3V respectively after passing through a power supply regulator circuit. Figure 2 As shown, pin 1 of the male connector is connected to the constant power supply, and pin 10 of the male connector is connected to the ACC power supply.

[0020] The CAN circuit includes eight channels, each using eight TJA1051 chips. The outputs of three TJA1051 chips are connected to the MCU chip corresponding to the secondary MCU circuit, the outputs of three TJA1051 chips are connected to another MCU chip corresponding to the secondary MCU circuit, and the outputs of two TJA1051 chips are connected to the MCU chip corresponding to the primary MCU circuit. The primary MCU circuit uses an STM32H723VGT6 chip, and the secondary MCU circuit uses an STM32G473CBT6 chip.

[0021] Specifically, pins 1 and 4 of TJA1051 chip U10 are connected to pins PA11 and PA12 of the MCU chip corresponding to the main MCU circuit; pins 6 and 7 are connected to pins 6 and 16 of the TE174055-2 male connector, which then connect to the CAN bus. Pins 1 and 4 of TJA1051 chip U11 are connected to pins PD11 and PD12 of the MCU chip corresponding to the main MCU circuit; pins 6 and 7 are connected to pins 5 and 15 of the TE174055-2 male connector, which then connect to the CAN bus. Pins 1 and 4 of TJA1051 chip U12 are connected to pins PA11 and PA12 of one of the MCU chips corresponding to the secondary MCU circuit; pins 6 and 7 are connected to pins 7 and 17 of the TE174055-2 male connector, which then connect to the CAN bus. Pins 1 and 4 of TJA1051 chip U13 are connected to pins PB12 and PB13 of one of the MCU chips corresponding to the secondary MCU circuit; pins 6 and 7 are connected to pins 8 and 18 of the TE174055-2 male connector, which then connects to the CAN bus. Pins 1 and 4 of TJA1051 chip U14 are connected to pins PA11 and PA12 of one of the MCU chips corresponding to the secondary MCU circuit; pins 6 and 7 are connected to pins 9 and 19 of the TE174055-2 male connector, which then connects to the CAN bus. Pins 1 and 4 of TJA1051 chip U15 are connected to pins PA11 and PA12 of another MCU chip corresponding to the secondary MCU circuit; pins 6 and 7 are connected to pins 2 and 12 of the TE174055-2 male connector, which then connects to the CAN bus. Pins 1 and 4 of the TJA1051 chip U16 are connected to pins PB12 and PB13 of the other MCU chip in the secondary MCU circuit; pins 6 and 7 are connected to pins 3 and 13 of the TE174055-2 male connector, which then connect to the CAN bus. Pins 1 and 4 of the TJA1051 chip U17 are connected to pins PA11 and PA12 of the other MCU chip in the secondary MCU circuit; pins 6 and 7 are connected to pins 4 and 14 of the TE174055-2 male connector, which then connect to the CAN bus.

[0022] It should be noted that the TJA1051 chip includes capacitors and resistors, from... Figure 3 The specific electronic components and their connections can be found in the manual, and will not be repeated here for the sake of brevity.

[0023] It should be further explained that the PB14 and PB16 pins of the TM32H723VGT6 are connected to the pins of one STM32G473CBT6 chip, and the PE7 and PE8 pins of the STM32H723VGT6 are connected to the pins of another STM32G473CBT6 chip. Therefore, the CAN signals acquired by the MCU chip in the secondary MCU circuit can be sent to the MCU chip in the primary MCU circuit. Furthermore, since the two MCU chips in the secondary MCU circuit can acquire six CAN signals, while the one MCU chip in the primary MCU circuit can acquire two CAN signals, this invention uses the interconnection of three relatively inexpensive MCU chips to achieve real-time recording of eight CAN (CANFD) bus data channels, thereby reducing the overall cost of the recorder and facilitating its widespread use.

[0024] In this embodiment, the PC8, PC9, PC10, PC11, PC12, PD0, PD2, and PA8 pins of the MCU chip in the main MCU circuit are connected to the TF card storage circuit, and data is read / written through the TF card storage circuit.

[0025] Optionally, the TF card storage circuit can use a standard T-Flash card.

[0026] In this embodiment, the MCU chip corresponding to the main MCU circuit is connected to the 4G module through a data transmission circuit. The data transmission circuit is used to realize communication and data transmission between the MCU chip and the 4G module. The 4G module establishes a communication connection with the server to receive and send information. The MCU chip parses and packages the information obtained from the CAN bus according to the protocol and sends it to the server through the 4G module. The control commands from the server are transmitted to the MCU chip through the 4G module. The MCU chip, according to the control content, opens and reads the diagnostic information of a specific ECU through the CAN circuit. The data transmission circuit uses a high-speed USB chip USB3300-EZK-TR. The 4G module uses a module SC200L-INTERNAL. Specifically, the PC2, PC3, PA3, PA5, PB0, PB1, PB10, PB11, PB12, PB13, and PB5 pins of the MCU chip are connected to the high-speed USB chip USB3300-EZK-TR, and the USB_DM and USB_DP pins of the module SC200L-INTERNAL are connected to the high-speed USB chip to perform communication and data transmission between the MCU chip and the 4G module.

[0027] It should be noted that the USB3300-EZK-TR chip includes capacitors and resistors, from... Figure 4 The specific electronic components and their connections can be found in the manual, and will not be repeated here for the sake of brevity.

[0028] The power supply regulator circuit includes multiple voltage regulator chips. Among them, the LM2576S-ADJ voltage regulator chip reduces the 12V input voltage to 5V to power the CAN chip. The ME6119C33M5GA voltage regulator chip, electrically connected to the LM2576S-ADJ, reduces the 5V voltage to 3.3V to power the MCU chip, data transmission circuit, and TF card storage circuit. The ME6119C33M5GA voltage regulator chip includes U19, U20, U21, and U22. U19 powers the data transmission circuit and TF card storage circuit; U20 powers the MCU chip corresponding to the main MCU circuit; U21 and U22 power the two MCU chips corresponding to the secondary MCU circuit, respectively. The SPX29302T5 voltage regulator chip, electrically connected to the LM2576S-ADJ, reduces the 5V voltage to 3.8V to power the 4G module.

[0029] Among them, the LM2576S-ADJ, ME6119C33M5GA, and SPX29302T5 chips include capacitors and resistors, from Figure 5 The specific electronic components and their connections can be found in the manual, and will not be repeated here for the sake of brevity.

[0030] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Parts not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. An 8-channel CAN data logger, characterized in that, include: Male connector, which is used to input constant power supply, ACC power supply and 8-channel CAN signals; A CAN circuit, comprising 8 channels, wherein the CAN circuit is connected to the output terminal of the male connector; A secondary MCU circuit, comprising two MCU chips, wherein each MCU chip of the secondary MCU circuit is connected to the output of a 3-channel CAN circuit; The main MCU circuit has one MCU chip, which is connected to the output terminals of the two CAN circuits and the MCU chip of the secondary MCU circuit. A TF card storage circuit is used for reading / writing data, and the TF card storage circuit is connected to the output terminal of the main MCU circuit. The 4G module is used for wireless data transmission and is connected to the output terminal of the main MCU circuit. A power supply voltage regulator circuit, which is used to connect to the output terminal of the male connector; The power supply regulator circuit is used to supply power to the CAN circuit, the secondary MCU circuit, the main MCU circuit, the TF card storage circuit, and the 4G module.

2. An 8-channel CAN data logger according to claim 1, characterized in that: The MCU chip corresponding to the main MCU circuit is connected to the 4G module through a data transmission circuit, which is used to realize communication and data transmission between the MCU chip and the 4G module.

3. An 8-channel CAN data logger according to claim 1, characterized in that: The main MCU circuit uses an STM32H723VGT6 chip; the secondary MCU circuit uses an STM32G473CBT6 chip.

4. An 8-channel CAN data logger according to claim 1, characterized in that: The 8-channel CAN circuit uses 8 TJA10513CBT6 chips.

5. An 8-channel CAN data logger according to claim 2, characterized in that: The power supply regulation circuit includes multiple voltage regulator chips; among them, the LM2576S-ADJ voltage regulator chip is used to reduce the 12V voltage to 5V to power the CAN chip; the ME6119C33M5GA voltage regulator chip is used to reduce the 5V voltage to 3.3V to power the MCU chip; the ME6119C33M5GA voltage regulator chip is used to reduce the 5V voltage to 3.3V to power the data transmission circuit and TF card storage circuit; and the SPX29302T5 voltage regulator chip is used to reduce the 5V voltage to 3.8V to power the 4G module.

6. An 8-channel CAN data logger according to claim 2, characterized in that: The data transmission circuit uses a high-speed USB chip, USB3300-EZK-TR.

7. An 8-channel CAN data logger according to claim 1, characterized in that: The 4G module uses the SC200L-INTERNAL module.

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